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Showing 12 of 1617 documents

SEASONAL CHANGES IN RAPTOR NUMBERS AT ARMIDALE, NEW SOUTH WALES

Posted: 26/09/2021
Author(s): STEPHEN J. S. DEBUS

Transect counts and other observations in 1980 and 1984-1985 revealed a winter low and summer peak in raptor numbers and species diversity at Armidale (N.S.W.). Most of the common species were more numerous in summer than in winter; literature data indicate that these species are correspondingly more numerous in winter than in summer in some […]

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SEASONAL CHANGES IN ABUNDANCE AND POND PREFERENCES OF WATERBIRDS AT MOITAKA SEWERAGE WORKS, PORT MORESBY, PAPUA NEW GUINEA

Posted: 26/09/2021
Author(s): H. L. BELL

Data are given on abundance of the more common waterbirds at Moitaka sewerage works, Port Moresby. Egrets and Pied Herons showed few seasonal fluctuations whereas Australasian Grebes, Black-winged Stilts and Masked Lapwings increased after the breeding-season. Terns were annual passage migrants. Jacanas occurred only when the south-east trade winds accumulated scum into firm mats. Species […]

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DENSITY OF BIRDS IN EUCALYPT WOODLAND NEAR ARMIDALE, NORTH-EASTERN NEW SOUTH WALES

Posted: 26/09/2021
Author(s): HUGH A. FORD, LYNDA BRIDGES and SUSAN NOSKE

Birds were counted along four 8-9 ha transects 50 m wide throughout 1981. Densities averaged 8.3-11.1 birds/ha. with numbers tending to be highest in winter and lowest in spring. About 50% of individuals belonged to species that are insectivorous, 35% were honeyeaters (eating nectar and insects) and about 13% were of graminivorous species. Frugivores and […]

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